Ruthenium-Catalyzed Hydrogenation of Alkynylstannanes with Migration of the Stannyl Group
摘要:
Molecular hydrogen adds to aliphatic and aromatic alkynylstannanes in the presence of a ruthenium catalyst, pushing the stannyl group to the adjacent carbon atom to give alpha-substituted vinylstannanes. This is the first achievement of hydrogenation of alkynylstannanes, which is applicable also to the deuteration affording precursors for an important class of deuterium-labeled compounds.
Molecular hydrogen adds to aliphatic and aromatic alkynylstannanes in the presence of a ruthenium catalyst, pushing the stannyl group to the adjacent carbon atom to give alpha-substituted vinylstannanes. This is the first achievement of hydrogenation of alkynylstannanes, which is applicable also to the deuteration affording precursors for an important class of deuterium-labeled compounds.
Catalytic, Enantioselective Synthesis of Polycyclic Nitrogen, Oxygen, and Sulfur Heterocycles via Rh-Catalyzed Alkene Hydroacylation
作者:Kevin L. Vickerman、Levi M. Stanley
DOI:10.1021/acs.orglett.7b02230
日期:2017.10.6
Enantioselective synthesis of polycyclic nitrogen, oxygen, and sulfur heterocycles by rhodium-catalyzed intramolecular alkene hydroacylation is reported. The intramolecular hydroacylation reactions generate 1,4-dihydrocyclopenta[b]indol-3(2H)-ones and 3,4-dihydrocyclopenta[b]indol-1(2H)-one in moderate-to-high yields (65–99%) with good-to-excellent enantioselectivities (84–99% ee). The catalyst system
据报道,通过铑催化的分子内烯烃加氢酰化反应可对映选择性地合成多环氮,氧和硫杂环。分子内加氢酰化反应生成1,4-二氢环戊二烯并[ b ]吲哚-3-(2 ħ) -酮和3,4-二氢环戊二烯并[ b ]吲哚-1-(2- ħ) -酮在中度到高的产率(65-70 99%)具有良好至优异的对映选择性(84–99%ee)。该催化剂体系还促进3-乙烯基呋喃-,3-乙烯基苯并噻吩-和3-乙烯基噻吩-2-甲醛的烯烃加氢酰化反应,以中等至高的收率(71-91%的收率)产生相应的酮产物,并具有出色的对映选择性( 97–99%ee)。